Non-contact type human iris recognition method for correcting a rotated iris image

a human iris and image correction technology, applied in the field of non-contact iris recognition methods, can solve the problems of inability to accurately detect the deformed or slanting eye image and many errors in the real application of the conventional iris recognition system

Inactive Publication Date: 2002-10-24
EVERMEDIA
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Problems solved by technology

However, the conventional iris recognition system contains many errors in real applications.
Currently, most conventional iris recognition methods have drawbacks in that they cannot accurately detect the deformed or slanted eye image, other than manually readjusting the image after defining an arbitrary center of the pupil or using a mean value of the entire image to readjust the slanted image.

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  • Non-contact type human iris recognition method for correcting a rotated iris image
  • Non-contact type human iris recognition method for correcting a rotated iris image
  • Non-contact type human iris recognition method for correcting a rotated iris image

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[0021] In the following description, for purposes of explanation rather than limitation, specific details are set forth such as the particular architecture, interfaces, techniques, etc., in order to provide a thorough understanding of the present invention. For purposes of simplicity and clarity, detailed descriptions of well-known devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0022] FIG. 1 is a flowchart illustrating the operation steps of normalizing the iris image of a person according to the present invention. Referring to FIG. 1, in step 110, the eye image is acquired using any commercially available image acquisition device equipped with an infrared illuminator and a visible light rejection filter. The image acquisition device typically generates a reflective light to be gathered in the pupil of the eye region, so that information indicative of the iris image can be generated. In step 120, the i...

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Abstract

The present invention relates to an iris recognition method for correcting a rotated iris image. The iris image is acquired by an image acquisition device using an infrared illuminator. The inner and outer boundaries of the iris are detected by analyzing the differences in pixels using a Canny edge detector and the image for the inputted iris image, so as to allow the boundaries of the iris to be more accurately detected from the eye image of a user. If the iris image acquired has been rotated at an angle with respect to the centerline of the iris, the rotated iris image is corrected for subsequent authentication purposes.

Description

CLAIM OF PRIORITY[0001] This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. Section 119 from an application for "NON-CONTACT TYPE HUMAN IRIS RECOGNITION METHOD BY CORRECTION OF ROTATED IRIS IMAGE," filed earlier in the Korean Industrial Property Office on Mar. 6, 2001, and there duly assigned Ser. No. 2001-11441.[0002] 1. Field of Invention[0003] The present invention relates to a non-contact iris recognition method of authenticating the identity of a person. More particularly, the present invention relates to a method for correcting a rotated iris image during the authentication process.[0004] 2. Description of the Related Art[0005] An iris recognition system is used for identifying the identity of a person by distinguishing one's own particular iris pattern. The iris recognition system is superior in its accuracy in terms of personal identification compared to the other biometric methods, such as voice or fingerprint....

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06K9/00A61B5/117G06T1/00G06T3/00G06T7/00H04N7/18
CPCG06K9/00597G06V40/18G06F18/00
Inventor CHO, SEONG-WON
Owner EVERMEDIA
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